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Income taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

Loss before provision for income taxes consists of the following:

		December 31,
		2016				2015				2014
		U.S. dollars in thousands
Domestic (Israel)		$	15,765			$	13,388			$	7,022
Foreign (US)			41				1,953				-
		$	15,806			$	15,341			$	7,022

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The components of income tax provision consist of the following:

		December 31,
		2016				2015				2014
		U.S. dollars in thousands
Current Provision for income taxes:
Domestic (Israel)		$	5			$	-			$	-
Foreign (U.S)			166				24				-
Total current provision for income taxes		$	171			$	24			$	-
Previous years adjustments – foreign			50				-				-
Deferred tax benefit – foreign			(5)				-				-
Total provision for income tax		$	216			$	24			$	-

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

A reconciliation setting forth the differences between the effective tax rates of the Company and the Israeli statutory tax rate is as follows:

		December 31,
		2016				2015				2014
Israeli tax provision at statutory rate			25.00	%			26.50	%			26.50	%
Foreign/state rate differences			(0.32)	%			(0.22)	%			0.00	%
Non-deductible stock based compensation			(1.11)	%			(4.53)	%			(2.54)	%
Previous years taxes			(0.47)	%			0.00	%			0.00	%
Differences form which deferred taxes were not recorded			0.19	%			0.20	%			0.00	%
Changes in valuation allowance			(18.39)	%			(22.02)	%			(5.35)	%
Adjustment of deferred taxes due to tax rate changes			(5.89)	%			0.00	%			0.00	%
Other permanent differences			(0.38)	%			(0.09)	%			(18.61)	%
			(1.37)	%			(0.16)	%			0.00	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

Significant components of the Company’s deferred tax assets are as follows:

		December 31,
		2016			2015
		U.S. dollars in thousands
Operating loss roll forward		$	5,685		$	3,580
Reserves and allowances			1,956			2,185
Net deferred tax asset before valuation allowance			7,641			5,765
Valuation allowance			(7,636)			(5,765)
		$	5		$	-

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319

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Tabular disclosure of income before income tax between domestic and foreign jurisdictions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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